Shaft-boring apparatus.



PATENTED NOV. 20, 1906.

1 UNITED sTTFs PATNT oFFIoF.

EDUARD FRIEH AND RUDOLF N OLLEN'BURG, OF NORD-HAUSEN, GERMANY,

ASSIGNORS TO DEUTSCHE TIEFBOHR -AKTIEN GESELLSCHAFT, -O NORDHAUSEN,GERMANY, A CORPORATION.

SHAFT-BORING APPARATUS.-`

To a/ZZ whom it may con/cern:

Be it known that we, EDUARD FRIEH, whose post-office address is N o. 18Erfurterstrasse, and RUDOLF NLLFNBURG, whose post-office address is No.13 Rothenburgerstrasse, Nordhausen7 Kingdom of Prussia, German Empire,subjects of the King of Prussia, German Emperor, have invented a new anduseful Shaft-Boring Apparatus, of which the following is aspecification.

The several forms of percussion shaft-boring apparatus at presentemployed fory soil containing a large amount of water, but notquicksand, are operated from the surface of the ground by being raisedand lowered bymeans of rods or cables whether the work is performed by asingle large drill or for the purpose of reducing the weight by a groupof small drills mounted in a fixed frame. The momentum to be overcome inraising the drills requires considerable non-productive expenditure ofpower and disadvantageously limits the number of strokes. The greatstroke indispensable for obtainingza good blow results, under thepresent circumstances, in large losses in friction and water at the wallof the shaft, which in view of thel large masses employed is of greatdisadvantage.

The present-invention obviates the above drawbacks and greatly1increases the afli-l ciency of the lboring by the arrangement within arevoluble air-tight casing of a group of automatic drills, each of whichis operated independently from a point in proximity to its point ofapplication.

The invention 1s illustrated in the an- Figure 1 is a sectional ingapparatus constructed in accordance with my invention. Fig. 2 Jis ahorizontal section thereof, and Fig. 3 is a detail view showing theconstruction of the individual drills.

Referring to the drawings in detail, A is `a cylinder of 'steel or othersuitable material and of any desired size, which is made airtight byplates B B, secured/'within and in proximity to each end thereof...Communicatin with the exterior of each of the plates B an B and passingthrough the air-tight chambers are a plurality of tubes E, which forminlet-pipes for admitting water to the drill-heads F of the drills C',mounted within at their upper ends to a plate D. Secured to the plate Dis a cover G, to which is con-` nected arod H, by means of which theapparatus may be rotated. J is a mud-drum mounted on the cover G.

As shown in Fig. 3, the raising of the drillheads F is effected by meansof solenoids s s s, fed by the conductor Z. Springs f are provided forneutralizing the shock due to the falling of the drill-head and alsoassisting the drills in rising on the next stroke.

As indicated in the drawings by the arrows, the water before escapingvvto the bot-r tom ofthe shaft circulates about each drill, whereby anadvantageous cooling of the coils which become heated during operationis obtained. On escaping from the apparatus and rising between the.apparatus and the wall of the shaft the circulation of water carriesaway the small stones, and owing to the sud. den reduction ofvelocitydeposits the heavier Patented Nov. 20, 1906. 'J

said tubes and which are detachably secured stones above the mud-drum J,into which they fall. The slime or stones can be removed from the latterwithout any interference with the operation of the apparatus by means ofspecial devices or can be raised to the surface with the apparatusitself when it becomes necessary to change the drills.

Owing to the great capacity obtained in' this way; at a comparativelysmall cost the apparatus can be used 'not only for boring shafts underwater, but also advantageously employed in sinking shafts in dry ormarshy places.

Having thus described our invention, what we claimas new, and. desire tosecure by Letters Patent, is v 1. In a shaft-boring apparatus,the'combination of a rotatable casing, a plurality of drill-containingtubes mounted therein, a drill having an up-and-downfstroke mounted ineach of said tubes, a tube surrounding each of said drill-containingltubes and forming water-circulating means'and operating means carried byeach of said drills.

2. In a shaft-boring apparatus, the/combiloo nation of a rotatablecasing, a group of drillsl carried thereby, mechanism carried by each ofsaid drillsto raise the same and springs arranged on each drill andadapted to assist the raising of said drill, substantially as and for 1o5 theK purpose specified.

AB. ln a shaft-boring apparatus, the combi\ nation with a casingconstructed as an air vesselv and carrying a group ofseparatelyoperateddrills, essentially as and for thc purpose described.

4. In a shaft-boring4 apparatus, the combination of a rotatable casing,a grou of drillst IOy carried thereby, mechanism carrie by each of saiddrills to raise the same' and springoperated means mounted on each drilland adapted to assist the said mechanism in raising each of said drills,substantially as set forth. k,

In testimony whereof We have hereunto set our hands in presence of twosubscribing 15 Witnesses.

EDUARD FEIEH. y RUDOLF NOLLENBURG.

Witnesses:` i

HENRY HAsPER, WQLDEMAR HAUPT

